XML 78 R61.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Loans Receivable (Forecast Adjustment) (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Forecasted net cash flows | $ 95.7
Provision for Credit Losses | (70.6)
Removal of COVID forecast adjustment [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Forecasted net cash flows | 149.5
Provision for Credit Losses | (118.5)
Implementation of enhanced forecasting methodology [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Forecasted net cash flows | (53.8)
Provision for Credit Losses | $ 47.9

X
- Definition Forecasted net cash flows + References No definition available. + Details
Name: | cacc_ForecastedNetCashFlows
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Provision for Credit Losses + References No definition available. + Details
Name: | cacc_ProvisionForCreditLosses
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsegmentsAxis=cacc_RemovalOfCOVIDForecastAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=cacc_ImplementationOfEnhancedForecastingMethodologyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |